Note 202 — Chapter XXII
Reading edition
The distinction between Sarvâstivâdin and Mûlasarvâstivâdin is not clear to me. I can only suggest that when a section of the school accepted the Mahâvibhâshâ and were known as Vaibhâshikas others who approved of the school chiefly on account of its excellent Vinaya called themselves Primitive Sarvâstivâdins.